drm/exynos/ipp: simplify property list allocation

prop_list is always allocated, so instead of allocating it dynamically
the pointer can be replaced by the structure itself.

Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>

diff --cc drivers/gpu/drm/exynos/exynos_drm_fimc.c
Simple merge

diff --cc drivers/gpu/drm/exynos/exynos_drm_gsc.c
Simple merge

diff --cc drivers/gpu/drm/exynos/exynos_drm_ipp.c
Simple merge

diff --cc drivers/gpu/drm/exynos/exynos_drm_ipp.h
Simple merge

diff --cc drivers/gpu/drm/exynos/exynos_drm_rotator.c
Simple merge